作者katiekatie (小白猪)
看板NTUE_Nse97
标题Re: [闲聊] 好心人士..
时间Sun Oct 8 14:12:07 2006
※ 引述《vickybear68 (熊)》之铭言：
: 有没有哪位好心人士可以把礼拜三要交的分析作业题目po在板上呀!
: 我深怕我礼拜二回家会很晚了...
: 作业来不及写...
: po文可以赚逼币唷!!
: 帮帮我吧!!!
: 一想到要回台北就头痛呀!!
: 塞塞塞塞塞.......= =
5-8:A method of analysis yields weights for gold that are low by 0.4mg.
Calculate the percent relative error caused by this uncertainty if
the weight of gold in the sample is
*(a)700mg.
(b)450mg.
*(c)250mg.
(d)40mg.
5-9:The method described in Problem5-8 is to be used for the analysus of
ores that assay about 1.2% gold. What minimum sample weight should be
taken of the relative error resulting from a 0.4-mg loss is not to exceed
*(a)-0.2%
(b)-0.5%
*(c)-0.8%
(d)-1.2%
5-11:A loss of 0.4 mg of Zn occurs in the course of an analysis for that
element. Calculate the percent relative error due to this loss if the
weight of Zn in the sample is
*(a)40mg
(b)175mg
*(c)400mg
(d)600mg
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1F：→ katiekatie:闲着也是闲着~~~我来当ㄧ下好心人士 10/08 14:13
2F：推 conective:偷推 10/08 14:47
3F：推 magic66:a和c前面怎都有*号 10/08 15:25
4F：推 KEBT:就是後面有答案的意思 10/08 15:29
5F：→ KEBT:好心人士...可以再给课本後面的答案吗?!拜托!! 10/08 15:30
6F：推 kimkuo:推 打题目很辛苦 10/08 16:29
7F：推 vickybear68:谢谢好心人士!! 10/08 18:17
8F：推 flyingangela:这是一定要推一下的啦~~~真是好心人:p 10/08 19:12
9F：推 blackjack0s:原来朱姐是好人...(笔记) 10/08 20:03
10F：推 jkychen: 原来朱姐是好人...(笔记) 10/09 00:10